Mongolia, the Tangut country, and the solitudes of Northern Tibet: being a narrative of three years travel in Eastern High Asia /
Przhevalʹskiĭ, Nikolaĭ Mikhaĭlovich,1839-1888.
Yule, Henry,Colonel, C.B.
Morgan, E. Delmar,F.R.G.S.
London,
1876.
Natural history